https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68924
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Peter Cordes from comment #3)
> For the reverse, we get:
>
> long long extract(__m128i v) {
> return ((__v2di)v)[0];
> }
>
> subl $28, %esp
> vmovq %xmm0, 8(%esp)
> movl 8(%esp), %eax
> movl 12(%esp), %edx
> addl $28, %esp
> ret
>
> MOVD / PEXTRD might be better, but gcc does handle it. It's all using
> syntax that's available in 32-bit mode, not a special built-in.
Please report this problem in the another PR (it is the case of missing v->r
alternative in *vec_extractv2di_0_sse pattern for SSE4+, where we can split
directly to movd/pextrd).
The original problem is fixed for gcc-9.
